Advantech PCM-9550F, Руководство пользователя

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102 PCM-9550F/FM/L User's Manual
A.1 Programming the watchdog timer
In order to program the watchdog timer, you must write a program
which writes I/O port address 443 (hex). The output data is a value
of time interval. The value range is from 01 (hex) to 3E (hex), and
the related time interval is 1 sec. to 62 sec.
Data Time Interval
01 1 sec.
02 2 sec.
03 3 sec.
04 4 sec.
.
.
.
3E 62 sec.
After data entry, your program must refresh the watchdog timer by
rewriting the I/O port 443 (hex) while simultaneously setting it.
When you want to disable the watchdog timer, your program
should read I/O port 443 (hex).